onagraceous

Updated: May 11, 2025

After having detailed at some length those proofs which seem to be the most striking, and which had not been previously described with sufficient detail, we may now take a hasty survey of other contingent cases. In the first place the cruciate flowers of some onagraceous plants should be remembered. Leaves placed in whorls of three are very rare.

Hugo de Vries - Species and Varieties, Their Origin by Mutation